Measurement of thett¯production cross section inpp¯collisions ats=1.96 TeVusing soft electronb-tagging
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Abstract
We present a measurement of the top-quark pair-production cross section in $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\text{ }\mathrm{TeV}$ using a data sample corresponding to $1.7\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of integrated luminosity collected with the Collider Detector at Fermilab. We reconstruct $t\overline{t}$ events in the $\mathrm{\text{lepton}}+\mathrm{\text{jets}}$ channel, consisting of $e\ensuremath{\nu}+\mathrm{\text{jets}}$ and $\ensuremath{\mu}\ensuremath{\nu}+\mathrm{\text{jets}}$ final states. The dominant background is the production of $W$ bosons in association with multiple jets. To suppress this background, we identify electrons from the semileptonic decay of heavy-flavor jets (``soft electron tags''). From a sample of 2196 candidate events, we obtain 120 tagged events with a background expectation of $51\ifmmode\pm\else\textpm\fi{}3$ events, corresponding to a cross section of ${\ensuremath{\sigma}}_{t\overline{t}}=7.8\ifmmode\pm\else\textpm\fi{}2.4(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}1.6(\mathrm{syst})\ifmmode\pm\else\textpm\fi{}0.5(\mathrm{lumi})\text{ }\text{ }\mathrm{pb}$. We assume a top-quark mass of $175\text{ }\text{ }\mathrm{GeV}/{c}^{2}$. This is the first measurement of the $t\overline{t}$ cross section with soft electron tags in run II of the Tevatron.
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